switch to typescript

src/frontend/components/HelpOverlay.vue

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+<template>
+  <div class="overlay transparent" @click="$emit('bgclick')">
+    <table class="overlay-content help" @click.stop="">
+      <tr><td>⬆️ Move up:</td><td><div><kbd>W</kbd>/<kbd>↑</kbd>/🖱️</div></td></tr>
+      <tr><td>⬇️ Move down:</td><td><div><kbd>S</kbd>/<kbd>↓</kbd>/🖱️</div></td></tr>
+      <tr><td>⬅️ Move left:</td><td><div><kbd>A</kbd>/<kbd>←</kbd>/🖱️</div></td></tr>
+      <tr><td>➡️ Move right:</td><td><div><kbd>D</kbd>/<kbd>→</kbd>/🖱️</div></td></tr>
+      <tr><td></td><td><div>Move faster by holding <kbd>Shift</kbd></div></td></tr>
+
+      <tr><td>🔍+ Zoom in:</td><td><div><kbd>E</kbd>/🖱️-Wheel</div></td></tr>
+      <tr><td>🔍- Zoom out:</td><td><div><kbd>Q</kbd>/🖱️-Wheel</div></td></tr>
+      <tr><td>🖼️ Toggle preview:</td><td><div><kbd>Space</kbd></div></td></tr>
+      <tr><td>🧩✔️ Toggle fixed pieces:</td><td><div><kbd>F</kbd></div></td></tr>
+      <tr><td>🧩❓ Toggle loose pieces:</td><td><div><kbd>G</kbd></div></td></tr>
+    </table>
+  </div>
+</template>
+<script lang="ts">
+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  name: 'help-overlay',
+  emits: {
+    bgclick: null,
+  },
+})
+</script>